离子液体-有机溶剂复合技术处理含油污泥的研究

采用离子液体辅助溶剂萃取法处理胜利油田的含油污泥并回收原油,考察了不同溶剂、剂油比、温度、反应时间、离心机转速等条件对油和沥青质脱附效率的影响。结果表明:最佳的实验条件为在正庚烷-离子液体Emim]BF4]溶剂体系中,V(溶剂)/m(油)为50mL/3g,温度50℃,反应时间20min,离心机转速2 000r/min;在此条件下,含油污泥中油的回收率高达90.5%,沥青质的回收率为83.1%;正庚烷和离子液体可以回收重复使用,正庚烷的一次和二次回收率分别为89.2%和74.2%;离子液体几乎没有损失,一次和二次回收率分别高达98.6%和95.4%;使用二次回收的正庚烷和离子液体为溶剂时油和沥青质的回收率分别达到85.1%和78.4%。在此基础上,探讨了含油污泥脱附过程的作用机理。离子液体-有机溶剂复合技术显著提高了油泥萃取的油回收率,对油泥的无害化和资源化工业生产具有重要的参考价值。

STUDY ON TREATMENT OF OILY SLUDGE WITH IONIC LIQUID AND ORGANIC SOLVENT COMPOSITE TECHNOLOGY

Ionic liquid assisted extraction method was selected to recover oil from oily sludge, of Shengli Oil Field. The effects of solvent systems, solvent-oil ratio, temperature, reaction time and stirring speed were investigated. Experimental results showed that the desorption efficiency of oil and asphaltenes were 90.5 % and 83.1 %, respectively under the following conditions: using n-heptane and ionic liquid Emin]BF4] as solvent system, the solvent-oily sludge ratio of 50/3, ionic liquid 10 mL, temperature 50℃, reaction time 20 min, stirring speed 2000 r/min. In addition, n-heptane and ionic liquid can be recycled with high recovery efficiency. The primary and secondary recovery rates of n-heptane are 89.2% and 74.2%, respectively, the recovery of ionic liquid is more than 95.4 %. The recovery rates of oil and asphaltenes are more than 85 % and 75 %, respectively. The desorption mechanism of oil from sludge was studied. It is concluded that the oil recovery from oily sludge is improved significantly by ionic liquid and solvent composite technology.